subman20

hi guys im building a b18a1 motor for boost and not sure what pistons or ratio to go with??? I know stock is a 81mm I was thinking to do a 82mm je or wisco piston with a 9.5:1 ratio with eagle h beam rod and a eagle forged crank with acl race bearing looking to get about 350hp head will have a brian crower stage 2 turbo cam supertech valve train my turbo is a turbonetics t3/to4e ceramic ball bearing turbo ........ so what my question is do these pistons sound good for this build is it reliable for 15psi.... or more idk tho any input would be great

kyden

if you're going to overbore, I would go no bigger than 81.5. use your oem crank.

subman20

yeah i was thinking the same thing now thanks bro

kpjo4

you can get away with 30 over, but from experience and what I SEE and not stories most people I personally know go 20 over on a ls, thus leading to a rounded 81.5mm bore

frost_white_ej1

no point of building the block and head for that hp goal save all your money from building your motor and get neptune or hondata s300 with a 255lp fuel pump and some 650cc adjustable fuel pressure regulator and get it tune you should be able to get 350hp reliability on stock motor alone.

subman20

i got a hondata s300 and RC 550cc and walbro fuel pump

justYncredible

iTrader: (1)

Psi is meaningless
I say don't get the adjustable fpr like someone mentioned earlier. I think the build list you provided can yield that power level listed. Stock crank is fine and if your going to bore the stock sleeves go to 81.5mm. The injectors maybe a limiting factory, I would go with 750cc just to have more wiggle room